elephantcandy LiveFX, free

Compatibility: iPad (requires iOS 6.0 or later)

LiveFX is an iPad effects processor that can process sounds from a live input, the app’s built-in track player (which works with iTunes) or Audiobus. It utilises the device’s touchscreen to give control over a host of DJ-style effects.

Although the app itself is free, the full version requires an in-app purchase.

Wilson Holliday Audulus 1.9, £10.49/$14.99

Compatibility: iPad (requires iOS 6.0 or later)

Modular iPad synth Audulus has undergone a major update, adding a selection of new features designed to make creating and browsing patches easier. Audiobus support and Audio Copy/Paste have both been added too.